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annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 677:934fd358c944

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Updated revisions for files affected by gunzip module addition.
author Vladimir Homutov <vl@nginx.com>
date Wed, 12 Sep 2012 10:12:35 +0000
parents 08140f6b7964
children ce121bf644f5
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_memcached_module"
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11 link="/en/docs/http/ngx_http_memcached_module.html"
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12 lang="en"
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13 rev="2">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_http_memcached_module</literal> module allows to obtain
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19 responses from a memcached server.
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20 The key is set in the <var>$memcached_key</var> variable.
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21 A response should be put in memcached in advance via means that are
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22 external to nginx.
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23 </para>
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24
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25 </section>
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26
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27
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28 <section id="example" name="Example Configuration">
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29
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30 <para>
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31 <example>
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32 server {
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33 location / {
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34 set $memcached_key "$uri?$args";
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35 memcached_pass host:11211;
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36 error_page 404 502 504 = @fallback;
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37 }
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38
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39 location @fallback {
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40 proxy_pass http://backend;
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41 }
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42 }
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43 </example>
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44 </para>
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45
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46 </section>
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47
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48
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49 <section id="directives" name="Directives">
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50
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51 <directive name="memcached_buffer_size">
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52 <syntax><value>size</value></syntax>
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53 <default>4k|8k</default>
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54 <context>http</context>
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55 <context>server</context>
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56 <context>location</context>
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57
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58 <para>
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59 Sets <value>size</value> of the buffer used for reading a response
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60 received from the memcached server.
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61 A response is passed to a client synchronously, immediately as it is received.
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62 </para>
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63
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64 </directive>
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65
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66
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67 <directive name="memcached_connect_timeout">
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68 <syntax><value>time</value></syntax>
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69 <default>60s</default>
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70 <context>http</context>
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71 <context>server</context>
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72 <context>location</context>
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73
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74 <para>
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75 Defines a timeout for establishing a connection with the memcached server.
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76 It should be noted that this timeout cannot usually exceed 75 seconds.
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77 </para>
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78
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79 </directive>
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80
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81
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82 <directive name="memcached_gzip_flag">
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83 <syntax><value>flag</value></syntax>
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84 <default></default>
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85 <context>http</context>
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86 <context>server</context>
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87 <context>location</context>
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88 <appeared-in>1.3.6</appeared-in>
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89
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90 <para>
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91 Enables the test for the <value>flag</value> presence in the memcached
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92 server response and sets the request header field
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93 “<literal>Content-Encoding</literal>” to “<literal>gzip</literal>”
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94 if the flag is set.
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95 </para>
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96
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97 </directive>
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98
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99
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100 <directive name="memcached_next_upstream">
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101 <syntax>
364
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102 <literal>error</literal> |
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103 <literal>timeout</literal> |
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104 <literal>invalid_response</literal> |
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105 <literal>not_found</literal> |
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106 <literal>off</literal>
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107 ...</syntax>
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108 <default>error timeout</default>
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109 <context>http</context>
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110 <context>server</context>
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111 <context>location</context>
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112
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113 <para>
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114 Specifies in which cases a request should be passed to the next server:
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115 <list type="tag">
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116
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117 <tag-name><literal>error</literal></tag-name>
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118 <tag-desc>an error occurred while establishing a connection with the
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119 server, passing it a request, or reading the response header;</tag-desc>
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120
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121 <tag-name><literal>timeout</literal></tag-name>
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122 <tag-desc>a timeout has occurred while establishing a connection with the
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123 server, passing it a request, or reading the response header;</tag-desc>
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124
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125 <tag-name><literal>invalid_response</literal></tag-name>
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126 <tag-desc>a server returned empty or invalid response;</tag-desc>
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127
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128 <tag-name><literal>not_found</literal></tag-name>
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129 <tag-desc>a response was not found on the server;</tag-desc>
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130
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131 <tag-name><literal>off</literal></tag-name>
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132 <tag-desc>disables passing a request to the next server.</tag-desc>
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133
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134 </list>
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135 </para>
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136
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137 <para>
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138 It should be understood that passing a request to the next server is
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139 only possible if a client was not sent anything yet.
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140 That is, if an error or a timeout occurs in the middle of
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141 transferring a response, fixing this is impossible.
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142 </para>
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143
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144 </directive>
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145
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146
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147 <directive name="memcached_pass">
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148 <syntax><value>address</value></syntax>
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149 <default/>
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150 <context>location</context>
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151 <context>if in location</context>
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152
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153 <para>
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154 Sets an address of the memcached server.
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155 An address can be specified as a domain name or an address, and a port,
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156 for example,
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157 <example>
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158 memcached_pass localhost:11211;
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159 </example>
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160 </para>
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161
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162 <para>
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163 If a domain name resolves to several addresses, all of them will be
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164 used in a round-robin fashion.
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165 In addition, an address can be specified as a
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166 <link doc="ngx_http_upstream_module.xml">server group</link>.
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167 </para>
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168
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169 </directive>
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170
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171
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172 <directive name="memcached_read_timeout">
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173 <syntax><value>time</value></syntax>
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174 <default>60s</default>
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175 <context>http</context>
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176 <context>server</context>
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177 <context>location</context>
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178
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179 <para>
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180 Defines a timeout for reading a response from the memcached server.
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181 A timeout is only set between two successive read operations,
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182 not for the transmission of the whole response.
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183 If a memcached server does not transmit anything within this time,
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184 a connection is closed.
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185 </para>
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186
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187 </directive>
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188
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189
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190 <directive name="memcached_send_timeout">
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191 <syntax><value>time</value></syntax>
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192 <default>60s</default>
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193 <context>http</context>
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194 <context>server</context>
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195 <context>location</context>
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196
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197 <para>
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198 Sets a timeout for transmitting a request to the memcached server.
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199 A timeout is only set between two successive write operations,
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200 not for the transmission of the whole request.
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201 If a memcached server does not receive anything within this time,
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202 a connection is closed.
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203 </para>
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204
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205 </directive>
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206
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207 </section>
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208
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209 </module>